Tool holder for machine tool, and cutter and tool driver used in the tool holder

ABSTRACT

A tool holder for machine tool capable of surely preventing the cutting fluid oil, fed into a passage through-hole (e) in a tool holder main body ( 1 ), from leaking the connection part between a cutter ( 10 ) and the tool holder during the machining of a workpiece; the cutter used in the tool holder; and a tool driver used in the tool holder; the tool holder for machine tool, comprising the passage through-hole (e) at the rotating center part (x) of the holder main body ( 1 ), allowing the cutter ( 10 ) having a cutting fluid path (e 5 ) formed therein to be inserted into the front part of the passage through-hole (e), and being formed so that the cutter ( 10 ) is fixed by a fixing means ( 3 ) fitted to the tip of the holder main body ( 1 ), wherein a cylindrical female surface part for sealing ( 10   b ) is formed at the rear end part of the cutter ( 10 ), a cylindrical female surface part for sealing (e 3   a ) allowing the cylindrical male surface part for sealing ( 10   b ) to be inserted closely therein is formed in the passage through-hole (e), a ring groove (h) is formed in the cylindrical female surface part for sealing (e 3   a ), and a ring-shaped packing ( 12 ) for sealing an annular clearance between the cylindrical male surface part for sealing ( 10   b ) and the cylindrical female surface part for sealing (e 3   a ) is fitted into the ring groove (h).

FIELD OF THE INVENTION

The present invention relates to a tool holder for machine tool and atool driver used in the tool holder.

BACKGROUND OF THE INVENTION

A tool holder as shown in FIG. 8, which is attached or detached on aspindle of a machine tool, has been already existed. The outlineconfiguration of the tool holder is as follows.

That is, 1 is a tool holder main body, and consists of a directcylindrical shaft part 1 a, a flange part 1 b and a taper-shank part 1c. A through-hole “a” is formed in a rotating center part “x” of thetool holder 1, and female screw threads a1, a2 are formed in front andrear parts of the inner peripheral surface of the through-hole “a”.Numeral 2 is a collet that is inserted into a taper hole of the directcylindrical shaft part 1 a. Numeral 3 is a collet fixing means that isfixed on a male screw thread “b” formed in the anterior outer peripheralsurface of the direct cylindrical shaft part 1 a, which consists of anut body 3 a, a ring rod member 3 b and a combining member 3 c. Numeral4 is a pull-stud that is fixed on the posterior end of the taper-shankpart 1 c through the female screw thread a2.

Numeral 5 is an adjusting screw, which has a male screw thread formed inthe outer peripheral surface and is installed on the middle of thelength of the female screw thread a1 as the front and rear positions canbe adjusted. A through-hole “c” is formed in the center of the adjustingscrew 5, and the posterior part of a through-hole “c” is formed intohexagon hole c1. To the inside of a through-hole part a3 of a front sideof the adjusting screw 5, a tool driver 6 shown in FIG. 9 is insertedclosely and slidably in longitudinal direction.

An outer peripheral surface of the tool driver 6 is formed in smoothingsurface, and driver pins 7, 7 protrude on the peripheral surface part ofthe tool driver 6 facing to its diameter direction. The driver pins 7, 7are guided by guide rails “d”, “d” which are formed in an innerperipheral surface of the through-hole part 3 a. Partial passagethrough-holes e1, e2, e3 which form a part of a below-mentioned passagethrough-hole formed in the rotating center part “x” of the holder mainbody 1 are provided to the center of the tool driver 6.

Numeral 8 is a cutting liquid communicating tube. A front end thereof isairtightly inserted into the partial passage through-hole e2 through anO ring, and on the other hand, a back end thereof is airtightly insertedinto the anterior part of the central hole e4 of the pull-stud 4 throughan O ring.

Numeral 10 is a cutter having a cutting fluid path e5 with a smalldiameter to the center of its main body. The cutter 10 is inserted intothe through-hole part a3 of the holder main body 1 and a fitting femalepart forming the partial passage through-hole e3 in the forefrontposition of the tool driver 6 by way of the central hole “f” of thecollet 2. As shown in FIG. 10, a peripheral surface notching part 10 acalled a tongue etc. is formed on a posterior part of the cutter 10. Inthis case, the fitting female part e3 is what a diameter part of a frontend of the tool driver 6 is cut in the shape of a groove. A rubberpacking 11 is pasted down a bottom surface of the fitting female part e3with adhesives.

When equipping the holder main body 1 with the cutter 10 of the toolholder, first the nut body 3 a of the collet fixing means 3 is loosenedto make the collet 2 in the open status. Then, the bottom of the cutter10 is inserted from the collet 2 front side by way of a central hole “f”of the collet 2, and the peripheral surface notching part 10 a is fittedon the fitting female part e3. In this case, a back end surface of theperipheral surface notching part 10 a is pressed to the rubber packing11 at the bottom of the fitting female part e3. This status is held, andthe nut 3 a is clamped tight.

Therefore, the cutter 10 is fastened to the holder main body 1 throughthe collet 2, and the cutting fluid path e5 of the cutter 10 and thepartial passage through-holes e1, e2, e3 of the tool driver 6 arecommunicated airtightly.

While using the tool holder, cutting fluid mist or cutting fluidsupplied from a spindle side of the machine tool passes through thecentral hole e4 of the pull-stud 4, and thereafter reaches the passagethrough-hole “e” of the holder main body comprising the cutting fluidcommunicating tube 8, the partial passage through-holes e1, e2, e3, andthe through-hole part a3. Furthermore, it passes through the cuttingliquid path e5 of the cutter 10, spouts from an opening of the tipthereof, and lubricates a friction part of the cutter 10 to a work.

There are the following troubles in the tool holder of the conventionalmachine tool.

That is, when equipping the holder main body 1 with the cutter 10, it isrequired to push backward the cutter 10 with sufficient force, to pressthe back end surface of the peripheral surface notching part 10 a to therubber packing 11 at the bottom of the fitting female part e3, and toclamp the collet fixing means 3 as holding this status. If thusattaching operation is not performed completely, the cutting fluid mistor the cutting fluid leaks from the part of the rubber packing 11 duringa machining.

Besides, when the collet fixing means 3 fastens insufficiently thecutter 10 due to a certain cause, relative rotation of the cutter 10 tothe holder main body 1 can not be regulated by any effect any longer,and processing by this cutter 10 can not continue.

Besides, when pressing the tool holder to the work strongly, the cutter10 tends to slide backward to the collet 2. In this case, since therubber packing 11 catches the back end of the cutter 10, the cutter 10is not surely prevented from moving, and sometimes moves backward to thespindle. Accordingly, it is feared that machining accuracy may beinjured.

An object of the present invention is to provide a tool holder formachine tool and a tool driver etc., which can solve the above-mentionedtroubles.

SUMMARY OF THE INVENTION

The present invention relates to a tool holder for machine tool asfollows. Plural guiding grooves parallel to a spindle direction areprovided on the inner peripheral surface of a through-hole at a rotatingcenter part of a tool holder main body. A tool drive that regulatesrelative rotation with the holder main body and can control front andrear positions by sliding along the spindle direction is assembled bythe guiding grooves. A partial passage through-hole forming a part ofthe through-hole is formed at the rotating center part of the tooldriver. A cutter comprises a cylindrical male surface part for sealingformed on the rear-outer peripheral part, a male surface part forregulating rotation comprising plane surface bodies formed at the frontof it, and a half-moon shaped plane part formed at each front edge ofthem. Instead of the male surface part for regulating rotation and thehalf-moon shaped plane part, a groove for regulating longitudinal movecomprising plane surfaces and half-shaped plane parts of the front andrear edges thereof may be formed. Here, the male surface part forregulating rotation is formed by cutting a fixed range of peripheralsurface of the cutter, and the groove for regulating longitudinal moveis formed by cutting a fixed range of the peripheral surface in concaveshape. To the front-inner peripheral surface of the partial passagethrough-hole of the tool driver, a cylindrical female surface part forsealing to seal up the cylindrical male surface part for sealing of thecutter, and a fitting female part regulating relative rotation byfitting the plane surface bodies of the male surface part for regulatingrotation or the concave of the groove for regulating longitudinal move.A barrier surface of the fitting female part contacts on the half-moonshaped plane part, thereby regulating relative rotation in longitudinaldirection. A ring groove is formed to the inner peripheral surface ofthe cylindrical female surface part for sealing, and a ring-shapedpacking for sealing an annular clearance between the cylindrical malesurface part for sealing and the cylindrical female surface part forsealing is fitted into the ring groove.

According to this, the passage through-hole of the holder main body andthe cutting fluid path of the cutter are airtightly communicated throughthe cylindrical male surface part for sealing, the cylindrical femalesurface part for sealing and the ring-shaped packing. This communicatingstatus is not spoiled even if an amount of insertions changes within thecomparatively large range. In this case, the tool driver is incorporatedinto the passage through-hole, by changing the front and rear positionsof the tool driver, the length that the cutter protrudes from the frontend of the holder main body can be changed arbitrarily.

The tool driver forms the partial passage through-hole comprising a partof the passage through-hole of the holder main body to the centerthereof. To the anterior part of the partial passage through-hole areformed the cylindrical female surface part for sealing into which thecylindrical male surface part for sealing of the cutter is airtightlyinserted through the O ring or its equivalent and the fitting femalepart which relative rotation is regulated by fitting the male surfacepart for regulating rotation, which a range of the peripheral surface iscut into the plane surface bodies or the groove part for regulatinglongitudinal move. On the other hand, to the posterior part of thepartial passage through-hole is fitted the ring-shaped packing to insertthe cutting fluid communicating tube airtightly. Besides, in the centerof the outer peripheral surface part thereof is provided a driver pinwhich is engaged with the guiding groove engraved on the innerperipheral surface of the through-hole of the holder main body.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a vertical sectional view of a tool holder for machine tool inthe present invention.

FIG. 2 is a perspective view of a cutter to be fitted to the toolholder.

FIG. 3 shows a tool drive of a tool holder, and FIG. 3A is a front viewand FIG. 3B is a vertical sectional view.

FIG. 4 is a view of a cuttter of the tool holder showing anothermodification.

FIG. 5 is a vertical sectional view of a tool holder for machine tool ofan alternate embodiment of the present invention.

FIG. 6 shows a tool driver and attachments thereto, and FIG. 6A is afront view thereof, FIG. 6B is a vertical sectional view thereof, andFIG. 6C is a perspective view thereof.

FIG. 7 is a perspective view of a cutter fitted to the tool holder ofFIG. 5.

FIG. 8 is a vertical sectional view of a conventional tool holder.

FIG. 9 shows a conventional tool driver, FIG. 9A is a front viewthereof, and FIG. 9B is a vertical sectional view thereof.

FIG. 10 is a view showing a conventional cutter.

PREFERRED EMBODIMENT OF THE INVENTION

Hereafter, one example of the present invention is explained withreference to FIGS. 1 to 3.

Here, the same sign is given to the same site as the thing of theconventional example among these figures.

The characteristic feature of the tool holder of the present inventionis explained as follows. Namely, as shown in FIG. 2, a male surface partfor regulating rotation 10 a of a peripheral surface notching part and acylindrical male surface part for sealing 10 b are arranged in orderinside the posterior part of a cutter 10.

The cylindrical male surface part for sealing 10 b is formed into whathas a straight cylindrical peripheral surface along a cuttercenter-of-rotation line. The male surface part for regulating rotation10 a, as shown in FIG. 2, comprises two parallel flat surface bodies“g”, “g” for regulating rotation in parallel to the cuttercenter-of-rotation, which are what a part of periphery of the cuttermain body with a circular cross section is cut and arranged in anopposite state that sandwiches the cutter center-of-rotation line.

Though a drill is shown in the figures as a representative example ofthe above-mentioned cutter 10, it may not be limited to this. This maybe a reamer, a tap, an end mill, a gun drill, a gun reamer, etc.

One end of the cutting fluid path e5 of the cutter 10 opens at the backend surface of the cutter main body (namely, the back end surface of thecylindrical male surface part for sealing 10 b), and the other end opensat the front end surface thereof. In this case, the cutting fluid pathe5 may be single or plural, and it does not interfere that it may bebranched in a plurality like the example of illustration.

Moreover, as shown in FIGS. 1 and 3, the cylindrical female surface partfor sealing e3 a into which the cylindrical male surface part forsealing 10 b is inserted and the fitting female part e3 b into which themale surface part for regulating rotation 10 a is internally fitted arearranged to the anterior part of the partial passage through-hole e1 ofthe tool driver 6 with order arrangement.

The cylindrical female surface part for sealing e3 a is formed into acylindrical hole of a big path for a while rather than the cylindricalmale surface part for sealing 10 b, and has ring groove “h” in themiddle of the longitudinal direction of the inner peripheral surfacethereof. A ring-shaped packing 12 is fitted into the ring groove “h”.Though it is good to use an O ring like the example of illustration asthe ring-shaped packing 12, it is not limited to this and it does notinterfere even if it is what is applied to the O ring correspondingly(an O ring equivalent). Here, the O ring equivalent means what a formand a property approximate to the O ring. For example, a whole form is aring shape, the cross section form in the middle of its length is athing like a square or a hexagon except a circle, and the quality of thematerial is rubber or what has the seal nature and elasticityapproximated to it.

The fitting female part e3 b is as following. That is, as shown in FIG.3 etc., a diameter part of the front end part of the tool driver 6 iscut more deeply than the longitudinal-direction length of the malesurface part for regulating rotation 10 a to form a fitting groove “i”,and the cross-section form of the fitting groove “i” is applied to oneof the male surface part for regulating rotation 10 a.

As shown in FIG. 3, whole longitudinal-direction lengths of the fittingfemale part e3 b and the cylindrical female surface part for sealing e3a are somewhat larger than ones of the cylindrical male surface part forsealing 10 b and the male surface part for regulating rotation 10 a,respectively. When inserting the cylindrical male surface part forsealing 10 b and the male surface part for regulating rotation 10 a intothe fitting female part e3 b and the cylindrical female surface part forsealing e3 a respectively, an insertion relative displacement inlongitudinal direction is regulated by connecting a cutter main bodyhalf-moon shaped plane part “j” formed at the front edge of the malesurface part for regulating rotation 10 a to a barrier surface “k” ofthe fitting female part e3 b. Besides, a clearance is formed between therear end of the cylindrical male surface part for sealing 10 b and abottom surface “m” of the cylindrical female surface part for sealing e3a.

In the tool holder of the present invention shown in FIG. 1, anexchanging of the cutter 10 is carried out as follows.

That is, when removing the cutter 10 from the holder main body 1, thenut 3 a body is first turned to a loosening side to the holder mainflame 1, and therefore, the collet 2 cancels a joint in the middle ofthe length of the cutter 10, and the cutter can move longitudinallyinside the central hole “f” of the collet 2.

Then, the anterior approach part of the cutter 10 is grasped by hand,and the cutter 10 is given a drawing force. Therefore, the cutter 10 ispulled forward against a resistance force of the O ring to the relativedisplacement between the cylindrical male part for sealing 10 a and thecylindrical female part for sealing e3 a.

On the other hand, when attaching the cutter 10, the cutter main body isinserted into the central hole “f” of the collet 2, thereafter screwingit to the holder main body 1. In this case, the cutter 10 is squeezed soas to apply the diameter direction of the male surface part forregulating rotation 10 a to one of the fitting groove “i” of the fittingfemale part e3 b. Therefore, the cylindrical male surface part forsealing 10 b is inserted into the cylindrical female surface part forsealing e3 a against the resistance force of the O ring 12. And besides,the male surface part for regulating rotation 10 a is fitted into thefitting female part e3 b in the state that the relative rotation isregulated.

When the cylindrical male surface part for sealing 10 b and the malesurface part for regulating rotation 10 a are completely inserted intothe cylindrical female surface part for sealing e3 a and the fittingfemale part e3 b, the half-moon shaped plane part “j” of the cutter 10is contacted to the barrier surface “k” of the tool driver 6 in thestate of metallic contact as shown in FIG. 1. And the insertion beyondit will be regulated. Thereafter, the nut body 3 a is screwed, andtherefore the cutter 10 is connected by the collet, and the attaching isfinished.

In using the above-mentioned tool holder, for example, a taper-shankpart 1 c is inserted into a taper hole of the spindle of the machiningcenter. In this state, the tool holder is fixed to the spindle throughthe pull-stud 4 in the state that an escape is regulated. Under thisfixed state, the tool holder is rotated together with the spindle andmoved longitudinally if needed. And from a spindle side, cutting fluidmist or cutting fluid is supplied into the passage through-hole “e” ofthe holder main body 1 by way of the central hole e4 of the pull-stud 4.

When the cutter 10 comes to cut a workpiece, though the rotation drivingforce of the spindle will be transmitted to the cutter 10, thetransmission is mainly transmitted to the cutter 10 through the collet 2from the holder main body 1. In this case, when the big rotationalresistance from the workpiece acts on the cutter 10, joint operation ofthe collet 2 is insufficient and the cutter 10 tends to rotaterelatively to the holder main body 1. In this case, the rotation forceof the holder main body 1 is transmitted to the cutter 10 necessarythrough a guide groove “d” of the holder main body 1, a driver pin 7,the fitting female part e3 b of the tool driver 6 and the male surfacepart for regulating rotation 10 a of the cutter 10. Then, the relativerotation of the cutter 10 to the holder main body 1 is preventedcertainly.

Moreover, though a pushing pressure comes to be given to the cutter 10from a cut object, the pressure is certainly supported by the metalliccontact between the half-moon shaped plane part “j” and the barriersurface “k” of the tool driver 6. Therefore, the cutter 10 is preventedfrom the relative displacement in longitudinal direction to the holdermain body 1.

On the other hand, though cutting fluid etc. tends to leak out from thecontact place between the cutter 10 and the tool driver 6, the O ring 12exists consolidatedly between the cylindrical male surface part forsealing 10 b and the cylindrical female surface part for sealing e3 aand fills air-tightly a clearance thereof. Therefore, the cutting fluidetc. can not flow to the outside of the O ring, and is certainlyregulated from leaking out from the contact place between the cutter 10and the tool driver 6.

In addition, when changing the amount of protrusion from the holder mainbody 1 of the cutter 10, for example, after being the state thatlongitudinal move of the cutter 10 is permitted, removing the pull-stud4 from the holder main body 1 and further drawing out a cutting fluidcommunicating tube 8, a wrench is fitted to a hexagon socket of anadjusting screw 5, the adjusting screw 5 is screwed as required, and alongitudinal position thereof may be changed.

The tool holder of the above-mentioned example can be performed asfollows.

The male surface part for regulating rotation 10 a is formed into asquare pole by cutting the part countering in each of the longitudinaldirection and the cross direction of the peripheral surface of thecutter main body. And the fitting female part e3 b is formed into asquare socket corresponding to the male surface part 10 a.

In this case, the male surface part for regulating rotation 10 a and thecylindrical male part for sealing 10 b are formed to the back end partof the cutter main body and the cutter point side rather than the malesurface part for regulating rotation 10 a, respectively.Correspondingly, the cylindrical female part for sealing e3 a and thefitting female part e3 b are formed to the front end part side of thetool driver 6 and the backside of the cylindrical female surface partfor sealing e3 a. According to this, an existing tap can be equipped asthe cutter 10 concerning the present invention.

Next, another example is explained with reference to FIGS. 5 to 7.

Here, the same sign is given to the same site as a thing as stated aboveamong these drawings.

The characteristic feature of the tool holder concerning the example isexplained as follows. The cutter 10 has the cylindrical male surfacepart for sealing 10 b with the same diameter as the cutter main body tothe back end part. Besides, a groove part for regulating longitudinalmove 10 c which is cut into a concave groove is formed the cutter tipside of the male surface part 10 b.

To form these cylindrical male surface part for sealing 10 b and thegroove part for regulating longitudinal move 10 c, for example, theperipheral surface part countering in the diameter direction in the rearend part of the cutter main body (the existing cutter is generally madewith such a thing) whose rear is formed into a right circular cylinderwith a same diameter is cut to form two parallel flat-surfaces n, nalong the cutter center-of-rotation line. In this case, cutter main bodyhalf-moon shaped plane parts j2 of the front and back ends of theparallel two flat-surfaces “n”, “n” serve as an operating part forregulating longitudinal displacement. Besides, a part on the backsidegroove part for regulating longitudinal move 10 c of the cutter servesas the cylindrical male surface part for sealing 10 b.

Moreover, as shown in FIG. 6, the cylindrical female surface part forsealing e3 a into which the cylindrical male surface part for sealing 10b is inserted is formed to the anterior part of the partial passagethrough-hole e1 of the tool driver 6. Besides, a male screw thread 6 ais formed to the anterior peripheral part of the tool driver 6.

The cylindrical female surface part for sealing e3 a is formed into acylindrical hole with a big diameter rather than the cylindrical malesurface part for sealing 10 b, and has ring groove “h” in the middle ofthe longitudinal direction of the inner peripheral surface. Then, thering-shaped packing 12 is fitted to the ring groove “h”. Though it isgood to use an O ring like the example of illustration as thering-shaped packing 12, it is not limited to this and it does notinterfere even if it is what is applied to the O ring equivalent as wellas the above-mentioned.

A nut body for cutter connection 13 having the fitting female part e3 binto which the groove part for regulating longitudinal move 10 c isinternally fitted is screwed on the male screw thread 6 a. The nut bodyfor cutter connection 13, as shown in FIG. 6, is provided with a frontwall 13 a and a female screw wall 13 b. A slit is formed in the specificdiameter part of the front wall 13 a as the fitting female part e3 b.Besides, comparatively big square holes “p”, “p” communicated with eachedge of the slit e3 b are formed to the opposite part of the femalescrew wall 13 b.

In the tool holder of this example, for example, the cutter 10 isexchanged as follows.

When removing the cutter 10 from the holder main body 1, first the nut 3a and the collet 2 are removed from the holder main body 1 by handoperation, next, the cutter 10 is pulled to a front side, the tooldriver 6 is drawn out from the cutting fluid communicating tube 8, andthe tool driver 6 and the nut body for cutter connection 13 are removedfrom the holder main body 1 together with the cutter 10.

Then, the nut body for cutter connection 13 is turned together with thecutter 10, and displaced to the front side from the male screw thread 6a of the tool driver 6 more than a constant rate. When a square-hole “p”is separated from the male screw thread 6 a, the groove part forregulating longitudinal move 10 c is displaced to the slit e3 b, and thecutter 10 is separated from the nut body for cutter connection 13.

On the other hand, when attaching the cutter 10 to the holder main body1, the reverse of the procedure of the previous removal is performed.

In use of the above-mentioned tool holder, if the cutter 10 comes to cuta workpiece, although the rotation driving force of the spindle of themachine tool will be transmitted to the cutter 10, the transmission istransmitted to the cutter 10 from the holder main body 1 through thecollet 2.

When a forward delivery force acts on the cutter 10 from the spindle,the cutter 10 comes to be pushed backward by pushing pressure of theworkpiece. The pushing pressure is certainly supported by contacting ofthe half-moon shaped plane part j2 of the front end of the groove partfor regulating longitudinal move 10 c and the barrier surface k1 of thenut body for cutter connection 13 in the metallic contact. Besides, itcomes to be supported auxiliary by the joint force of the collet 2.

Other points apply correspondingly to the previous example.

According to the above-mentioned invention, the following effects areacquired.

The passage through-hole of the tool holder main body can communicatewith the cutting fluid path of the cutter airtightly through thecylindrical male surface part for sealing, the cylindrical femalesurface part for sealing and the ring-shaped packing. Therefore, even ifthe longitudinal relative displacement of the cylindrical male surfacepart for sealing and the cylindrical female surface part for sealingarises, as long as the ring-shaped packing exists among these,regardless of the pushing force to the back of the cylindrical malesurface part for sealing, the communicating state can be held good.Therefore, cutting fluid supplied into the passage through-hole duringmachining a work due to the cutter is certainly prevented from leakingout from the connecting part of the tool driver and the cutter.

The protrude length from the front end of the holder main body of thecutter can be changed optionally by changing the front and rearpositions of the tool. Besides, according to this tool driver, actionand effect which aims in the invention related to the tool holder can beremarkably realized.

What is claimed is:
 1. A tool holder for machine tool comprising: a toolholder main body (1) having a passage through-hole (e) at a rotatingcenter part (X), a cutter (10) having a cutting fluid path (e5) which isinserted into an anterior part of said passage through-hole (e), andsaid cutter (10) being fixed on a tip of the tool holder main body (1)through a fixing means (3); wherein plural guiding grooves (d) parallelto a spindle direction on an inner peripheral surface of a through-hole(a3) at the rotating center part (X) of the tool holder main body (1), atool driver (6) regulating relative rotation to said tool holder mainbody (1) and adjusting front and rear positions by sliding along thespindle direction is incorporated, a partial passage through-hole of apart of the passage through-hole (e) is formed to the rotating centerpart (X) of the tool driver (6), a cylindrical male surface part forsealing (10 b) is formed at a rear-outer peripheral part of the cutter(10), a male surface part for regulating rotation (10 a) comprisingplane surface bodies which a fixed range of a peripheral surface is cutis formed at a front side of the cylindrical male surface part forsealing (10 b), half-moon shaped plane parts (j) are formed at a frontedge of the male surface part for regulating rotation (10 a), acylindrical female surface part for sealing (e3 a) to seal up thecylindrical male surface part for sealing (10 b) of the cutter and afitting female part (e3 b) regulating relative rotation by fitting theplane surface bodies of the male surface part for regulating rotation(10 a) are formed to a front-inner peripheral part of the partialpassage through-hole of the tool driver (6), a barrier surface (k) ofthe fitting female part (e3 b) is contacted to the half-moon shapedplane parts (j) to regulate a longitudinal relative displacement, a ringgroove (h) is formed on an inner peripheral surface of the cylindricalfemale surface part for sealing (e3 a), and a ring-shaped packing (12)for sealing an annular clearance between the cylindrical male surfacepart for sealing (10 b) and the cylindrical female surface part forsealing (e3 a) is fitted into the ring groove (h).
 2. A tool holder formachine tool comprising: a tool holder main body (1) having a passagethrough-hole (e) at a rotating center part (X), a cutter (10) having acutting fluid path (e5) which is inserted into an anterior part of saidpassage through-hole (e), and said cutter (10) being fixed on a tip ofthe tool holder main body (1) through a fixing means (3); wherein pluralguiding grooves (d) parallel to a spindle direction on an innerperipheral surface of a through-hole (a3) at the rotating center part(X) of the tool holder main body (1), a tool driver (6) regulatingrelative rotation to said tool holder main body (1) and adjusting frontand rear positions by sliding along the spindle direction isincorporated, a partial passage through-hole of a part of the passagethrough-hole (e) is formed to the rotating center part (X) of the tooldriver (6), a cylindrical male surface part for sealing (10 b) is formedat a rear-outer peripheral part of the cutter (10), a groove part forregulating longitudinal move (10 c) comprising plane surfaces (n) whicha fixed range of a peripheral surface is cut in a concave-shaped andhalf-moon shaped plane parts (j2) which are formed at front and rearedges of the plane surfaces (n) is formed at a front side of thecylindrical male surface part for sealing (10 b), a cylindrical femalesurface part for sealing (e3 a) to seal up the cylindrical male surfacepart for sealing (10 b) of the cutter and a fitting female part (e3 b)regulating relative rotation by engaging with a concave of the groovepart for regulating longitudinal move (10 c) are formed to a front-innerperipheral part of the partial passage through-hole of the tool driver(6), a barrier surface (k) of the fitting female part (e3 b) iscontacted to the half-moon shaped plane parts (j2) to regulate alongitudinal relative displacement, a ring groove (h) is formed on aninner peripheral surface of the cylindrical female surface part forsealing (e3 a), and a ring-shaped packing (12) for sealing an annularclearance between the cylindrical male surface part for sealing (10 b)and the cylindrical female surface part for sealing (e3 a) is fittedinto the ring groove (h).
 3. A tool driver used in the tool holder formachine tool of claim 1, wherein the partial passage through-hole of thetool driver (6) is communicated with the rotating center part (X) of theholder main body (1), a cylindrical female surface part for sealing (e3a) allowing the cylindrical male surface part for sealing (10 b) of therear end of the cutter to be airtightly inserted to the anterior part ofthe partial passage through-hole through an O ring or its equivalent(12) is formed, the fitting female part (e3 b) which the longitudinalrelative displacement is regulated by engaging with the male surfacepart for regulating rotation (10 a) comprising the plane surface bodieswhich a fixed range of the peripheral surface of the cutter is cut isformed, the barrier surface (k) of the fitting female part (e3 b) whichthe longitudinal relative rotation is regulated by fitting to thehalf-moon shaped plane part of the cutter is formed, a ring-shapedpacking (9 a) allowing a cutting fluid communicating tube (8) to beairtightly inserted is fitted on a posterior part of the partial passagethrough-hole, and a driver pin (7) engaging with the guiding groove (d)engraved on an inner peripheral surface of a through-hole (a3) of theholder main body (1) is provided in a center of an outer peripheralsurface part thereof.
 4. A tool driver used in the tool holder formachine tool of claim 1, wherein the partial passage through-hole of thetool driver (6) is communicated with the rotating center part (X) of theholder main body (1), a cylindrical female surface part for sealing (e3a) allowing the cylindrical male surface part for sealing (10 b) of therear end of the cutter to be airtightly inserted to the anterior part ofthe partial passage through-hole through an O ring or its equivalent(12) is formed, the fitting female part (e3 b) which engages with thegroove part for regulating longitudinal move (10 c) comprising the planesurfaces (n) and the half-moon shaped plane parts (j2) which a fixedrange part of the peripheral surface of the cutter is cut inconcave-shaped and regulates the relative rotation is formed, thebarrier surfaces (k1) of the fitting female part (e3 b) which thelongitudinal relative rotation is regulated by fitting to the half-moonshaped plane parts of the cutter respectively are formed, a ring-shapedpacking (9 a) allowing a cutting fluid communicating tube (8) to beairtightly inserted is fitted on a posterior part of the partial passagethrough-hole, and a driver pin (7) engaging with the guiding groove (d)engraved on an inner peripheral surface of a through-hole (a3) of theholder main body (1) is provided in a center of an outer peripheralsurface part thereof.